I've never noticed it, but they say extra flavoring may make the liquid require thinning. I've just had a lot of bad experiences with extra flavor, I got a coffee that was pure black and just tasted awful, my favorites had been blackberry and cola I started at 12mg so when I ordered them again I got 18mg nicotine with double flavor and neither one tastes as good as my regular flavoring 12 mg liquid. I ordered hypnotic mist from freedomsmokeusa in double flavor because they say its a light sweet flavor but it tastes very bland.
basically, I've never gotten double flavoring and been happy with it, I've found less nicotine with regular flavoring gives the best flavor, and it's not just that nicotine adds a peppery taste, but that the flavoring just seems weaker altogether. I guess I could try double flavor blackberry or cola in 12 mg, and then compare, but I'd rather just enjoy the flavor of 18-24mg liquid.
basically, I've never gotten double flavoring and been happy with it, I've found less nicotine with regular flavoring gives the best flavor, and it's not just that nicotine adds a peppery taste, but that the flavoring just seems weaker altogether. I guess I could try double flavor blackberry or cola in 12 mg, and then compare, but I'd rather just enjoy the flavor of 18-24mg liquid.